python 读写sql2008 类

import pymssql
class MSSQL:
    def __init__(self,host,user,pwd,db):
        self.host = host
        self.user = user
        self.pwd = pwd
        self.db = db

    def __GetConnect(self):
        if not self.db:
            raise(NameError,"没有设置数据库信息")
        try:
            self.conn = pymssql.connect(host=self.host,user=self.user,password=self.pwd,database=self.db,charset="utf8")
            #self.conn = pymssql.connect(self.host,self.user,self.pwd,self.db)
            cur = self.conn.cursor()
        except Exception as e:
            print(e)
        if not cur:
            raise(NameError,"连接数据库失败")
        else:
            return cur
    # 执行查询语句
    def ExecQuery(self,sql):
        cur = self.__GetConnect()
        cur.execute(sql)
        resList = cur.fetchall()

        #查询完毕后必须关闭连接
        self.conn.close()
        return resList
    # 执行非查询语句
    def ExecNonQuery(self,sql):
        cur = self.__GetConnect()
        cur.execute(sql)
        self.conn.commit()
        self.conn.close()
    # 进行数据插入
    def insert(self, tablename, params):
        """创建数据库表

            args：
                tablename  ：表名字
                key        ：属性键
                value      ：属性值
        """
        key = []
        value = []
        for tmpkey, tmpvalue in params.items():
            key.append(tmpkey)
            if isinstance(tmpvalue, str):
                value.append("\'" + tmpvalue + "\'")
            else:
                value.append(tmpvalue)

        try:
            attrs_sql = '(' + ','.join(key) + ')'
            values_sql = ' values(' + ','.join(value) + ')'
        except Exception as e:
            None
            # print(e)
            #print("****************************")

        sql = 'insert into %s'%tablename
        sql = sql + attrs_sql + values_sql
        print('_insert:'+sql)
        try:
            self.ExecNonQuery(sql)
        except Exception as e:
            None
            # print(e)

if __name__ == "__main__":

    ms = MSSQL(host="MY-PC\SQLEXPRESS",user="sa",pwd="*********",db="sqlTest")
    #ms = MSSQL("127.0.0.1","sa","*********","sqlTest")
    reslist = ms.ExecQuery("select * from student")
    for i in reslist:
        print(i)
    reslist = ms.ExecQuery("select name from student")
    for i in reslist:
        print(i)
    newsql="update student set name='%s' where id=1"%u'苏铭'
    print(newsql)
    ms.ExecNonQuery(newsql.encode('utf-8'))
    newsql="delete from student where name='Python测试2'"
    print(newsql)
    ms.ExecNonQuery(newsql.encode('utf-8'))
    newsql="insert into student (Name) values ('Python测试2')"
    print(newsql)
    ms.ExecNonQuery(newsql.encode('utf-8'))
    ms.insert('student',{'name':'lii'})#插入数据（指明表名称，字段名，字段内容对应的字典形式输入